Bump dependencies so it works on Java 10

It now compiles and runs on Java 10.

build.sbt

@@ -18,16 +18,16 @@ lazy val root = (project in file(".")).
 
     licenses := Seq("CC BY-SA 4.0" -> url("https://creativecommons.org/licenses/by-sa/4.0/legalcode")),
 
-    scalaVersion := "2.12.3",
+    scalaVersion := "2.12.6",
 
     libraryDependencies ++= Seq(
-        "org.antlr" % "antlr4" % "4.7",
-        "com.typesafe.scala-logging" %% "scala-logging" % "3.7.2",
+        "org.antlr" % "antlr4" % "4.7.1",
+        "com.typesafe.scala-logging" %% "scala-logging" % "3.9.0",
         "ch.qos.logback" % "logback-classic" % "1.2.3",
-        "com.github.jnr" % "jnr-ffi" % "2.1.6",
+        "com.github.jnr" % "jnr-ffi" % "2.1.7",
         "com.github.jnr" % "jffi" % "1.2.16" classifier "native",
-        "com.github.jnr" % "jnr-posix" % "3.0.41",
-        "org.scalatest" %% "scalatest" % "3.0.3" % "test",
+        "com.github.jnr" % "jnr-posix" % "3.0.44",
+        "org.scalatest" %% "scalatest" % "3.0.5" % "test",
         "junit" % "junit" % "4.12" % "test"
     ),
 
@@ -43,7 +43,7 @@ lazy val root = (project in file(".")).
 
     antlr4GenVisitor in Antlr4 := false,
 
-    antlr4Version in Antlr4 := "4.7",
+    antlr4Version in Antlr4 := "4.7.1",
 
     makeClasspathFile := {
       val cp = (fullClasspath in Runtime).value.files